System can appear to hang when booted in UEFI BIOS mode if the Sun Storage 6 Gb
SAS PCIe RAID HBA has old firmware (15763252, formerly CR 7125220)

System appears to hang when booted in UEFI BIOS mode if the Sun Storage 6 Gb SAS
PCIe RAID HBA is running an old version of the LSI firmware, version 10M09P9 or
older. Specifically, the Driver Configuration Protocol has to be called on each
device handle (there is no mechanism to associate it with the HBA device after it is
installed). The Unified Extensible Firmware Interface (UEFI) specification states
that the protocol is supposed to return EFI_UNSUPPORTED if called
for the wrong device. Instead, if older LSI firmware is running on the HBA, the HBA
driver attempts to use the device without checking it, which causes a processor
exception. The newer version of the HBA LSI firmware has fixed the protocol to check
the device and return the appropriate status code.